Georg von Zengen

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Delay Tolerant Networking (DTN) enables transfer of data where conventional network protocols fail to deliver data because no continuous end-to-end connectivity is available. While the Bundle Protocol (BP) has been established as the standard DTN protocol in many application areas, Wireless Sensor Networks (WSN) often use proprietary protocols with a subset(More)
This paper researches the potential of a novel ball switch as a wearable vibration sensor for activity recognition. The ball switch is available as a commercial, off-the-shelf sensor and is unique among such sensors due to its miniaturized design and the low mass of the ball. We present a detailed analysis of the physical properties of the sensor as well as(More)
Wireless Sensor Networkss (WSNs) nowadays are deployed in miscellaneous fields of application. Some use cases – especially those which include mobility – would benefit from a communication protocol that handles connection losses by design instead of assuming a continuous end-to-end connection. In this work, we describe the implementation of a Delay Tolerant(More)
Context prediction is the task of inferring information about the progression of an observed context time series based on its previous behaviour. Prediction methods can be applied at several abstraction levels in the context processing chain. In a theoretical analysis as well as by means of experiments we show that the nature of the input data, the quality(More)
We are surrounded by a sensor-enriched environment which is able to provide a broad spectrum of features from various sensor classes that can be utilised for situation and activity awareness. However, the probably most common sensor, shipped with nearly every electronic device nowadays such as mobile phones, notebooks, printers as well as keyboards, mouses,(More)
The overall goal of GINSENG is a wireless sensor network that will meet application-specific performance targets, and that will be proven in a real industry setting where performance is critical. This demonstrator shows some of the key outcomes of the GINSENG project such as energy-efficient wireless real-time closed loop control, performance debugging,(More)
Typical home automation systems consist of dense populated sensors and actuators in wireless networks. In apartment houses, networks are often deployed closely to each other by different neighbors. In such scenarios wireless networks suffer from packet loss caused by interference with other networks. Packet loss causes unnecessary delay and energy(More)
Being able to determine the location of a node is of great advantage in many IoT and WSN applications. For example, in health care scenarios or for autonomous configuration of IoT setups this information can be useful. One of the key challenges in localization is to estimate the distance between nodes. Most present indoor localization systems require(More)
Wireless sensor networks operate in open environments with potentially rough conditions. The utilised protocols to implement routing decisions in such networks are typically designed to work under challenging external influences. In this paper, we focus on the most popular representative, the Routing Protocol for Low Power and Lossy Networks (RPL), and(More)